French Silk Pie - cooking recipe

Ingredients

9-inch baked pie shell
1 c. sugar
3/4 c. softened butter
1 1/2 tsp. vanilla
1/4 tsp. cream of tartar
3 (1 oz.) sq. unsweetened chocolate, melted and cooled
3 eggs

Preparation

Beat sugar and butter until light and fluffy.
Stir in vanilla, cream of tartar and chocolate.
Beat in eggs until light and fluffy.
Pour into shell.
Refrigerate until set, 3 to 4 hours.
Top with Cool Whip to serve.